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The catalyst used in the contact process is

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{Fe}_{2} O_{3}

V_{2} O_{5}

{SO}_{3}

{Ag}_{2} O

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detailed solution

Correct option is B

Sulfuric acid is produced via the contact technique in the high quantities required for industrial processes. Vanadium(III) oxide ( $V_{2} O_{5}$ and $V_{2} O_{3}$ ), rather than vanadium(V) oxide, is recommended as the catalyst in this process.

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